信道估计误差下载波频偏对MIMO-OFDM系统性能的影响  

Effect of Carrier Frequency Offset on Performance of MIMO-OFDM Systems in the Presence of Channel Estimation Error

作　　者：李巨虎[1] 陈鹏[1] 贺志强[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学泛网无线通信教育部重点实验室,北京100876

出　　处：《华南理工大学学报（自然科学版）》2012年第3期43-48,63,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家重点基础研究发展计划项目(2009CB320401);新一代宽带无线移动通信网科技重大专项(2010ZX03003-003-01;2012ZX03004005-002)

摘　　要：多入多出-正交频分复用(MIMO-OFDM)系统中,信道估计误差和载波频偏是客观存在的.为研究MIMO-OFDM系统存在信道估计误差时载波频偏对系统的影响,文中使用迫零检测和Wishart分布的近似处理,从理论上推导出了瑞利信道和莱斯信道估计误差存在下,MIMO-OFDM系统受载波频偏影响的信干噪比及其概率分布,据此推导出了信道估计误差存在时载波频偏对系统平均差错概率和中断概率的影响.仿真结果表明,当系统存在信道估计误差时,较小的载波频偏会对系统产生较大的影响.In MIMO-OFDM systems,channel estimation error and carrier frequency offset are two objective existing factors.In order to investigate the effect of carrier frequency offset on the performance of MIMO-OFDM systems in the presence of channel estimation error,zero-forcing detectors and an approximation to the Wishart distribution are used to theoretically deduce the signal-to-interference-plus-noise ratio and its probability distribution for the system in the presence of estimation errors of Rayleigh and Rician fading channels,and the average error probability as well as the outage probability of the system is further obtained.Simulated results indicate that,in the presence of channel estimation error,even a small carrier frequency offset may greatly impact the performance of MIMO-OFDM systems.

关 键 词：多入多出-正交频分复用系统 WISHART分布 载波频率偏移 信道估计误差 

分 类 号：TN929[电子电信—通信与信息系统]